Scratch

Here is how it works, a certain guy/group comes up with a theme for the week, then users start to make scratch projects following that theme. Then they upload the projects and the projects get voted on.

Example: A sticky for SOTW 1 is made. The theme and further rules are in the first post of that topic. Then, all the way down, is people entering their projects. After 5 days have passed, users will vote on which project is best.

I think the hardest thing would probably be voting. Usually when I see forums with things like this, they have polls. I'm not sure if this place has polls, I've only been here for 1 day.

As a guy always looking for a new challenge, I like to "Compete" and I know somebody else does too.  Not only does it touch up on your scratch skills, whether you win or lose, but it's a lot of fun!